Update Dockerfile and global.json updates to v9.0.303 (#394)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # Refer to https://hub.docker.com/_/microsoft-dotnet-sdk for available versions
-FROM mcr.microsoft.com/dotnet/sdk:9.0.302-noble@sha256:d442f8270d12233f878df7fa280969fc2a7c892ae80d145eb1a1b8fb811eee83
+FROM mcr.microsoft.com/dotnet/sdk:9.0.303-noble@sha256:af75742bd2f6fd148504951b57a983bc410191729bf543eae467528d1bc175e5
 
 # Installing mono makes `dotnet test` work without errors even for net472.
 # But installing it takes a long time, so it's excluded by default.

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.302",
+    "version": "9.0.303",
     "rollForward": "patch",
     "allowPrerelease": false
   }